Electromagnetic valve selection of six factors should be paid attention to

by:AIRWOLF     2020-05-24
Electromagnetic valve selection should, in turn, follow the safety first, reliability, applicability and economy of the four principles, the second is based on the six aspects of the site condition ( The pipeline parameters and fluid parameters, pressure, electrical parameters, the movement way, choose special requirement) 。 Selection on the basis of: a, according to the length of continuous working time to choose: normally closed, normally open, sustainable electricity or 1, if open time is short and off or there is not much time, is normally closed type chosen. 2, but some conditions for security protection, such as a furnace, furnace flame monitoring, cannot choose normally open, choose the long-term operation. Second, according to the fluid parameter selection of electromagnetic valve: group 1 material, temperature, corrosive fluids: appropriate chooses electromagnetic valves and stainless steel corrosion resistance; Super clean fluid: appropriate chooses food grade stainless steel material electromagnetic valve. 2, high temperature fluid: should choose to use high temperature resistant electrician materials and sealing materials of the electromagnetic valve, piston structure type and selection. 3, fluid state: to have a gaseous, liquid or mixed state, especially the diameter greater than DN25 must distinguish when you order it. 4, fluid viscosity, usually under 50 CST can be arbitrary choice, if more than this value, should choose high viscosity is the electromagnetic valve. Three, according to the selection of pipe parameters of electromagnetic valve: size specifications ( The DN) , 1 interface mode, in accordance with the piping or flow required to determine the size (diameter DN) Size. 2, the interface way, general > (choose the flange interface, & le; (can according to user needs freedom of choice. Four, electric choice: voltage specifications should be preferred as far as possible choose AC220V, DC24 is more convenient. Five, according to the pressure parameter selection of solenoid valve: principle and the structure of 1, nominal pressure: the meaning of this parameter with other general valve door is the same, is set according to the pipe nominal pressure. 2, working pressure: if low working pressure must choose or step by step of moving straight acting principle; The minimum working pressure difference at 0. More than 4 mpa straight acting, step by step straight acting, guiding type all can choose. Six, according to the environmental requirements to choose auxiliary function: explosion-proof, check, manual, waterproof, water spray, fog diving 1, explosive environment, must choose corresponding explosion-proof grade of electromagnetic valve ( My company's existing: d II BT4, d CT5 II, Ex m I/II T4) 。 2, when tube fluid backflow phenomenon, can choose OK71 - my company N、OK72- N series with the function of check electromagnetic valve. 3, when need to electromagnetic valve and the manual operation, can choose OK71 - my company S、OK72- S series solenoid valve with manual function. 4, open-air installation or dust should choose more occasions waterproof, dust-proof varieties ( Degree of protection IP54 or more) 。 5, must be used for fountain diving type electromagnetic valve ( In IP68 protection grade or above) 。
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